Finding the Fourth Proportional to 86,022.10, 128,974.20 and 43,820.47

Step by Step Solution

1. Step 1: Write the proportion equation
   86,022.10 : 128,974.20 = 43,820.47 : x
2. Step 2: Convert to fraction form
   86,022.10/128,974.20 = 43,820.47/x
3. Step 3: Cross multiply
   86,022.10x = 128,974.20 × 43,820.47
4. Step 4: Simplify right side
   86,022.10x = 5,651,710,061.87
5. Step 5: Solve for x
   x = 5,651,710,061.87/86,022.10
6. Step 6: Final answer
   x = 65,700.68